ADU rules in Beaverton, OR — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Beaverton allows one ADU per detached dwelling unit in all residential zones under Development Code Chapters 40 and 60. Detached ADUs are limited to 800 sq ft; attached ADUs cannot exceed 50% of primary dwelling or 800 sq ft. Detached ADU height limit is generally 16 feet. No owner-occupancy requirement. No parking minimum near transit per state law.
Under Beaverton Development Code Chapters 40 and 60, one ADU is permitted per detached dwelling unit regardless of zoning district, consistent with Oregon ORS 197.312(5). ADUs must provide complete independent living facilities with a separate exterior entrance. Attached ADUs: up to 50% of primary dwelling's gross floor area or 800 sq ft, whichever is less. Detached ADUs: up to 800 sq ft. Junior ADUs (JADUs): up to 500 sq ft. Detached ADUs are generally limited to 16 feet in height. No owner-occupancy requirement per state law. No parking minimums near transit (HB 2001). Building permit plus mechanical, plumbing, and electrical permits required.
Unpermitted ADU construction: stop-work order and retroactive permit fees. Occupancy without final inspection: red-tagged until corrected.
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Side-by-side rule comparisons with other cities in Washington County.
See how other cities in Washington County handle adu rules.
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